Remove indyvdr-proxy image & client option

[gmulhearn]

As part of the VCX CI, we build and release the indyvdr-proxy docker image, as the indyvdr repo does not do this.

We also have a client component in VCX, which allows indy ledger interactions (anoncreds/DIDs read/write) to be performed via the client pointing to a running instance of the image.

This was previously developed by folks at Absa, however it hasn't been used in awhile and can be a burden to maintain (indy is generally full of legacy code).

This is opening a discussion about whether we still need these components within the VCX codebase.

[gmulhearn]

cc @JamesKEbert as discussed on today's call